JPH03124987A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the input and vibration during operation without requiring a counterweight and reduce the number of components by fitting members with the specific gravity larger than that of a crank shaft in the direction opposite to the eccentric direction of the eccentric section of the crank shaft. CONSTITUTION:Weight bars 17 made of a separate member with the specific gravity larger than that of a crank shaft 10 are buried and fitted in the direction opposite to the eccentric direction of the eccentric section 10a of the crank shaft 10 so as to negate the unbalance between the eccentric section 10a and a roller 5. The unbalance between the eccentric section 10a and the roller 5 by rotation is prevented, and no lower counterweight is required to be fitted at the lower end of the crank shaft 10. A lubricant is not stirred by the lower counterweight during operation, the input during operation is reduced, no cover surrounding the lower counterweight is required, and the number of components can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a p-tary compressor, and particularly to a rotary compressor having a structure suitable for reducing input, simplifying the structure, and reducing vibration. 0 [Prior Art] A conventional rotary compressor will be described with reference to FIGS. 3 and 4.

5 is a vertical sectional view of a conventional rotary compressor, and FIG. 4 is an enlarged view of the main part of the lower end of the crankshaft in FIG. 3. The rotary compressor shown in FIG. An electric motor 5 consisting of a rotation electron 1 and a stator 2 is disposed on the upper part of the motor 5, and a cylinder 4. Roller 5° main bearing 6. Secondary bearing7.
A compression mechanism section 9 constituted by a partition plate 8 is provided. The electric motor 5 and the compression mechanism section 9 are connected by a crankshaft 10. Lubricating oil 12 is stored at the bottom of the closed container 11.

A roller 5 is rotatably mounted on the eccentric portion 10a of the crankshaft 10.
is inserted.

During operation of such a rotary compressor, the compression mechanism section 9
A centrifugal force is generated between the eccentric portion 10a of the crankshaft and the roller 5. To offset this centrifugal force, rotor counterweights 13 and 14 are provided at the upper and lower ends of the end ring of the rotor 1, and a separate counterbalance weight 1 is provided at the lower end of the crankshaft 10.
5 is provided to maintain balance during rotation of the crankshaft 10. In addition, a cover 16 surrounding the lower counterweight 15 is provided to prevent the counterweight 15 from stirring up the lubricating oil 12 unnecessarily. 5
9-107984 is mentioned.

[Problem to be solved by the invention]

The above conventional technology uses an unbalanced weight 15 at the lower end of the crankshaft 10.
There was a problem that the input to the compressor increased during operation due to the provision of the crankshaft.The reason for this increase will be explained with reference to Fig. 4. -Fig. 4 is an enlarged view of the lower end of the shaft 1o. In FIG. 4, 7a is a spiral groove provided on the inner circumferential surface of the sub-bearing 7. 12a is lubricating oil that passes through the spiral groove a during operation; 12b is lubricating oil that similarly flows between the crankshaft 1o and the cover 16 during operation; Lower balance s15 is cover 1
6 is immersed in lubricating oil flowing into the tank. For this reason, when the compressor is in operation, the unbalance weight 15 receives resistance from the lubricating oil 12, which increases the input power to the compressor.

Furthermore, another problem is that the cover 16 is installed in such a way that the unbalanced weight 15 does not cause the lubricating oil 12 to be thrown around unnecessarily and the oil level of the lubricating oil 12 does not drop, so the number of parts increases by one point. That means you are doing it.

As stated above, the conventional technology
There was a problem of an increase in the number of parts.

The present invention was made to solve the problems of the prior art described above, and it eliminates the need to provide a counterbalance at the lower end of the crankshaft, reduces input and vibration during operation, and reduces the number of parts. The object of the present invention is to provide a rotary compressor that has the following characteristics.

[Means to solve the problem]

In order to achieve the above object, a rotary compressor according to the present invention has a configuration in which an electric motor and a compression mechanism section are connected by a crankshaft and housed in a closed container, and the compression mechanism section is a cylinder fixed to the container;
Nine rollers are provided in this cylinder and fitted into the eccentric part of the crankshaft, a partition plate that reciprocates following the rotation of this roller, and a main and sub-roller that seals both ends of the cylinder and supports the crankshaft. In a rotary compressor comprising a bearing, at an eccentric portion of the crankshaft. A separate member with a higher specific gravity than the material of the crankshaft is attached to the side opposite to the eccentric direction. [Function] The effects of the above technical means are as follows. In this example, a high specific gravity material, which is a separate member from the crankshaft, is attached to the eccentric portion of the crankshaft on the side opposite to the eccentric direction. As a result, when the crankshaft and the roller fitted to the eccentric part of the crankshaft rotate, the unbalance caused by the rotation is transferred to another member with a high specific gravity attached on the opposite side in the eccentric direction. The amount of cyan balance can be eliminated by reducing the amount or by further increasing the weight of another member.

Therefore, the unbalance weight, which was conventionally attached to the lower end of the crankshaft, is downsized and no longer needs to be attached, so the resistance of the lubricating oil that the separate unbalance weight receives is reduced, and the input to the compressor is reduced. Further, if the unbalance weight does not need to be attached, the cover can be removed because the unbalance weight does not stir up the lubricating oil unnecessarily, and the number of parts can be reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a vertical sectional view of a rotary compressor according to an embodiment of the present invention; The figure is an enlarged view of the main part of the A-jin section in FIG. 1. In the figure, parts with the same symbols as in FIG. 6 are the same parts as in the prior art.

In FIG. 1, 1 is a rotor, 2 is a stator, 3 rotors, 1. 4 is a cylinder fixed in a sealed container 11; 5 is a roller rotatably fitted into the eccentric portion 10 of the crankshaft 10; 6 is a motor that seals the upper end of the cylinder 4; Main bearing that supports the crankshaft 10, 7
9 is an auxiliary bearing that seals the lower end of the cylinder 4 and supports the crankshaft 10;
is the cylinder 4. Roller 5. Partition plate 8° Main bearing 6.
This is a compression mechanism section consisting of a sub-bearing 7 and the like.

As shown in FIG.
A compression mechanism section 9 is housed in the lower part of the motor 3, and the electric motor 3 and the compression mechanism section 9 are connected by a crankshaft 10. Lubricating oil 12 is stored at the bottom of the closed container 11. Here, at the eccentric portion 10aK of the crankshaft 10,
A weight par 17, which is a separate member having a higher specific gravity than the material of the crankshaft 10, is installed so as to penetrate and be embedded on the side opposite to the eccentric direction.

Figure 2 shows the details.

That is, as shown in FIG. 2, in the eccentric part 10a of the crankshaft 10, an elongated round bar made of another member having a specific gravity higher than the material of the crankshaft is placed within the circumference in the direction opposite to the eccentric direction. A plurality of weight pars 17 are inserted and fixed so as to be embedded concentrically with the crankshaft center, so as to cancel out the unbalance during rotation of the eccentric portion 10a and the roller 5.

The crankshaft is made of, for example, spheroidal graphite cast iron with a specific gravity of 7.8, and the weight bar Fi1, which is embedded as a separate member, is made of a material with a higher specific gravity, such as copper.

Brass or a commercially available high specific gravity material is used.

According to this embodiment, the crankshaft eccentric portion 10a and the roller 5
Since the unbalance due to rotation is eliminated, there is no need to correct the unbalance. This eliminates the need to attach a lower counterweight to the lower end of the crankshaft 10 as in the prior art.This makes it possible to stir the lubricating oil 12 with the lower counterweight while the rotary compressor is operating. This eliminates the need for input during operation, eliminates the need for a cover that forms a concave line on the lower counterbalance, and reduces the number of parts.

In the above embodiment, as shown in Fig. 1.2, the separate member for eliminating unbalance, which is attached to the opposite side of the eccentric direction of the eccentric part of the crankshaft, is a plurality of round rods embedded through the eccentric part of the crankshaft. Although a specific example has been described, the present invention is not limited to this. It goes without saying that other shapes and structures may be adopted as long as equivalent effects are expected.

〔Effect of the invention〕

As explained in detail above, according to the present invention, there is provided a rotary compressor that eliminates the need to provide a counterbalance at the lower end of the crankshaft, reduces input and vibration during operation, and has a reduced number of parts. can do.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a rotary compressor according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts of the AA cross section in FIG.
FIG. 3 is a longitudinal sectional view of a conventional rotary compressor, and FIG. 4 is an enlarged view of a main part of the lower end of the crankshaft in FIG. 3. 3...Electric motor, 4...Cylinder, 5...Roller,
6... Main bearing, 7... Sub bearing, 8... Partition plate, 9
...Compression mechanism section, 10...Crankshaft, 10a...
・Eccentric part, 11...Airtight container, 17...Weight bar・? Figure 4-m-Reso'-2゛5--~O-ra 10--Fla> middle white 1oa---I shoulder also tongue door 1 go--u 11 tobar-

Claims (1)

[Scope of Claims] 1. An electric motor and a compression mechanism unit are connected by a crankshaft and housed in a closed container, and the compression mechanism unit includes a cylinder fixed to the closed container and a unit inside the cylinder. A roller installed in the eccentric part of the crankshaft, a partition plate that reciprocates following the rotation of the roller, and main and sub bearings that seal both ends of the cylinder and support the crankshaft. A rotary compressor, characterized in that a separate member having a higher specific gravity than the material of the crankshaft is attached to the eccentric portion of the crankshaft on the side opposite to the eccentric direction. 2. A plurality of separate members having a specific gravity higher than that of the material of the crankshaft are inserted and fixed within the semi-circumference of the eccentric portion of the crankshaft in a direction opposite to the eccentric direction. rotary compressor.